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Fuel Jettison

Fuel Jettison:


What is fuel Jettison ?

 A jettison system is provided to avoid the necessity for heavy maintenance tasks, by providing a means to minimise the potential for an overweight landing. (The system is not required for certification reasons relating

to the performance of the aircraft). The system is activated by means of two dedicated pushbuttons ‘Arm’ and ‘Active’ located on the cockpit overhead panel. The system can be manually stopped by de-selection of

either of these pushbuttons, or automatically if all jettison/transfer pumps are running dry (low pressure) or when the fuel quantity drops below a predetermined target input by the flight crew.


Why is this Required ?

Landing at weights above the maximum design landing weight reduces the normal performance margins.

An overweight landing with an engine inoperative or a system failure may be less desirable than landing below maximum landing weight.

Fuel jettisoned above 5,000 to 6,000 feet will completely vaporize before reaching the ground. Therefore, general recommendation is to jettison fuel above 5,000 to 6,000 feet whenever possible, although there is no restriction on jettisoning at lower altitudes if considered necessary by the flight crew.



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